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Run results for:
slice VS splice VS shift: who is the fastest to keep constant size
100k list splice and shift win, they mutate list slice loose, it creates a copy of list 7.5x slower
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=611234" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0
Browser:
Firefox 139
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
shift
4.5M/s
splice
4.3M/s
slice
2K/s
View exact numbers
Test name
Executions per second
✓
shift
4,465,342 Ops/sec
splice
4,280,369 Ops/sec
slice
1,504 Ops/sec
Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); }
Tests:
slice
list.push('slice'); list = list.slice(1);
splice
list.push('splice'); list.splice(0, 1);
shift
list.push('splice'); list.shift();